A cataract is a clouding of the lens in the eye that affects vision. It develops slowly and eventually leads to decreased vision or vision loss if left untreated.

Food poisoning is illness caused by contaminated food or water. It is often bacterial, viral, or parasitic in origin.

Hyperthyroidism and hypothyroidism are both conditions related to the thyroid gland, a butterfly-shaped gland located in the front of the neck, just below the Adam's apple.